If we've a windows installation, we might wish to prevent from messing accidentally some window system directories, but at the same time you might want to have available the free space of that windows partition from our linux.

I'd recommend you to create a WORK FOLDER in that windows partition and remap that folder over the windows partition, so you can hide the sensible windows files at your linux session.

So easy like this:1) We create a WORK FOLDER in windows partition:cd /media/sda1 (Win partition)mkdir MYWINFOLDER

2) We remap over Windows partition sudo mount --bind /media/sda1/MYWINFOLDER/ /media/sda1/This way all Windows directories get hidden and protected to our activities.

Once done, we might wish to remove availability Windows from Grub by just updating the grub:sudo update-grubAs linux can't find windows installation (its overmapping), it updates the grub without the windows enterline.

Im applying this solution of my own to protect/hide windows system directories.

I thought it was a virus and reformatted my disks to get rid of it altogether. It wanted to totally own my PC as though it was its PC and was posting all sorts of information to god-knows-where. It even tried to prevent me from booting other systems.